SPALLANZANI, Lazzaro. De' Fenomeni della Circolazione osservata nel giro universale de'vasi..., Modena: Società Tipografica, 1773, 8° (205 x 125mm.), FIRST EDITION, engraved plate (some staining), modern half vellum with old lettering-piece, ownership stamp of G. Proietti, Spoleto, to title. [Heirs 983: "presented the results of his experiments on the circulation of the blood and the action of the heart"; Norman 1980; Prandi p. 35]